RHEL 7.*中部署11g RAC时_存储大于2T时asm裸设备如何做子分区划分

【引言】
在RHEL 7.*中部署11g RAC环境，最多只支持2T的裸设备；如果multipath划分的裸设备大小15T，则需要使用root操作用户下的parted 命令对盘阵进行分区，划分为小于等于2T的子裸设备。

示例如下：

mpathc (360002ac000000000000000960001ddbf) dm-5 3PARdata,VV              
size=3.4T features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
`-+- policy='service-time 0' prio=50 status=active
  |- 15:0:0:2 sdd 8:48  active ready running
  |- 15:0:1:2 sdg 8:96  active ready running
  |- 17:0:0:2 sdj 8:144 active ready running
  `- 17:0:1:2 sdm 8:192 active ready running
mpathb (360002ac000000000000000940001ddbf) dm-4 3PARdata,VV              
size=5.0T features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
`-+- policy='service-time 0' prio=50 status=active
  |- 15:0:0:1 sdc 8:32  active ready running
  |- 15:0:1:1 sdf 8:80  active ready running
  |- 17:0:0:1 sdi 8:128 active ready running
  `- 17:0:1:1 sdl 8:176 active ready running
mpatha (360002ac000000000000000920001ddbf) dm-3 3PARdata,VV              
size=15T features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
`-+- policy='service-time 0' prio=50 status=active
  |- 15:0:0:0 sdb 8:16  active ready running
  |- 15:0:1:0 sde 8:64  active ready running
  |- 17:0:0:0 sdh 8:112 active ready running
  `- 17:0:1:0 sdk 8:160 active ready running

[root@EthanDB mapper]# parted mpathb

Using /dev/dm-4
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) help                                                             
  align-check TYPE N                        check partition N for TYPE(min|opt) alignment
  help [COMMAND]                           print general help, or help on COMMAND
  mklabel,mktable LABEL-TYPE               create a new disklabel (partition table)
  mkpart PART-TYPE [FS-TYPE] START END     make a partition
  name NUMBER NAME                         name partition NUMBER as NAME
  print [devices|free|list,all|NUMBER]     display the partition table, available devices, free space, all found partitions, or a particular 

partition
  quit                                     exit program
  rescue START END                         rescue a lost partition near START and END
  
  resizepart NUMBER END                    resize partition NUMBER
  rm NUMBER                                delete partition NUMBER
  select DEVICE                            choose the device to edit
  disk_set FLAG STATE                      change the FLAG on selected device
  disk_toggle [FLAG]                       toggle the state of FLAG on selected device
  set NUMBER FLAG STATE                    change the FLAG on partition NUMBER
  toggle [NUMBER [FLAG]]                   toggle the state of FLAG on partition NUMBER
  unit UNIT                                set the default unit to UNIT
  version                                  display the version number and copyright information of GNU Parted
(parted)                                                                  
(parted)   

配置好子分区后，查看映射关系，并进行udev配置。

total 0
crw------- 1 root root 10, 236 Sep  3 19:42 control
lrwxrwxrwx 1 root root       7 Sep  3 19:42 mpatha -> ../dm-3
lrwxrwxrwx 1 root root       7 Sep  3 19:42 mpatha1 -> ../dm-8
lrwxrwxrwx 1 root root       7 Sep  3 19:42 mpatha2 -> ../dm-9
lrwxrwxrwx 1 root root       8 Sep  3 19:42 mpatha3 -> ../dm-10
lrwxrwxrwx 1 root root       8 Sep  3 19:42 mpatha4 -> ../dm-11
lrwxrwxrwx 1 root root       8 Sep  3 19:42 mpatha5 -> ../dm-12
lrwxrwxrwx 1 root root       8 Sep  3 19:42 mpatha6 -> ../dm-13
lrwxrwxrwx 1 root root       8 Sep  3 19:42 mpatha7 -> ../dm-14
lrwxrwxrwx 1 root root       8 Sep  3 19:42 mpatha8 -> ../dm-15
lrwxrwxrwx 1 root root       8 Sep  3 19:42 mpatha9 -> ../dm-16
lrwxrwxrwx 1 root root       7 Sep  4 00:21 mpathb -> ../dm-4
lrwxrwxrwx 1 root root       7 Sep  3 19:42 mpathc -> ../dm-5
lrwxrwxrwx 1 root root       8 Sep  3 19:42 mpathc1 -> ../dm-17
lrwxrwxrwx 1 root root       8 Sep  3 19:42 mpathc2 -> ../dm-18
lrwxrwxrwx 1 root root       7 Sep  3 19:42 vg_backup-lv_backup -> ../dm-7
lrwxrwxrwx 1 root root       7 Sep  3 19:42 vg_mpathb-lv_mpathb -> ../dm-2
lrwxrwxrwx 1 root root       7 Sep  3 19:42 vg_oracle-lv_oracle -> ../dm-6
lrwxrwxrwx 1 root root       7 Sep  3 19:42 vg_root-lv_root -> ../dm-0
lrwxrwxrwx 1 root root       7 Sep  3 19:42 vg_swap-lv_swap -> ../dm-1
[root@EthanDB mapper]# 

KERNEL=="dm-*", ENV{DM_UUID}=="part1-mpath-360002ac000000000000000920001ddbf", SYMLINK+="asm-diska1", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="dm-*", ENV{DM_UUID}=="part2-mpath-360002ac000000000000000920001ddbf", SYMLINK+="asm-diska2", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="dm-*", ENV{DM_UUID}=="part3-mpath-360002ac000000000000000920001ddbf", SYMLINK+="asm-diska3", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="dm-*", ENV{DM_UUID}=="part4-mpath-360002ac000000000000000920001ddbf", SYMLINK+="asm-diska4", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="dm-*", ENV{DM_UUID}=="part5-mpath-360002ac000000000000000920001ddbf", SYMLINK+="asm-diska5", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="dm-*", ENV{DM_UUID}=="part6-mpath-360002ac000000000000000920001ddbf", SYMLINK+="asm-diska6", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="dm-*", ENV{DM_UUID}=="part7-mpath-360002ac000000000000000920001ddbf", SYMLINK+="asm-diska7", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="dm-*", ENV{DM_UUID}=="part8-mpath-360002ac000000000000000920001ddbf", SYMLINK+="asm-diska8", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="dm-*", ENV{DM_UUID}=="part9-mpath-360002ac000000000000000920001ddbf", SYMLINK+="asm-diska9", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="dm-*", ENV{DM_UUID}=="part1-mpath-360002ac000000000000000960001ddbf", SYMLINK+="asm-diskc1", OWNER="grid", GROUP="asmadmin", MODE="0660"
KERNEL=="dm-*", ENV{DM_UUID}=="part2-mpath-360002ac000000000000000960001ddbf", SYMLINK+="asm-diskc2", OWNER="grid", GROUP="asmadmin", MODE="0660"

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